board/raspberrypi*: remove dtparam krnbt=on

The config.txt of the Rasperry Pi's supporting Wi-Fi and Bluetooth (i.e.
zero W, zero 2 W, 3, and 4) switch the Bluetooth function to use the
mini-UART (ttyS0) and restore UART0 (ttyAMA0) over the GPIOs 14 and 15
(as per miniuart-bt-overlay.dts[1]). All of them turn "on" the parameter
krnbt to autoprobe the bluetooth driver.

According to the README.md, the dtparam krnbt is now defaulting to "on"
since linux-raspberrypi 6.1.y[2]; it was defaulting to "off" before[3].

This removes the dtparam=krnbt=on from these config.txt files since the
value set is actually the default value.

[1]: https://github.com/raspberrypi/linux/blob/rpi-6.1.y/arch/arm/boot/dts/overlays/miniuart-bt-overlay.dts
[2]: https://github.com/raspberrypi/linux/blob/rpi-6.1.y/arch/arm/boot/dts/overlays/README#L294-L296
[3]: https://github.com/raspberrypi/linux/blob/rpi-5.10.y/arch/arm/boot/dts/overlays/README#L213-L215

Signed-off-by: Gaël PORTAY <gael.portay+rtone@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

board/raspberrypi/config_0w.txt

@@ -24,6 +24,3 @@ gpu_mem_1024=100
 
 # Enable UART0 for serial console on ttyAMA0
 dtoverlay=miniuart-bt
-
-# enable autoprobing of Bluetooth driver without need of hciattach/btattach
-dtparam=krnbt=on

board/raspberrypi/config_3.txt

@@ -24,6 +24,3 @@ gpu_mem_1024=100
 
 # Enable UART0 for serial console on ttyAMA0
 dtoverlay=miniuart-bt
-
-# enable autoprobing of Bluetooth driver without need of hciattach/btattach
-dtparam=krnbt=on

board/raspberrypi/config_3_64bit.txt

@@ -25,8 +25,5 @@ gpu_mem_1024=100
 # Enable UART0 for serial console on ttyAMA0
 dtoverlay=miniuart-bt
 
-# enable autoprobing of Bluetooth driver without need of hciattach/btattach
-dtparam=krnbt=on
-
 # enable 64bits support
 arm_64bit=1

board/raspberrypi/config_4.txt

@@ -24,6 +24,3 @@ gpu_mem_1024=100
 
 # Enable UART0 for serial console on ttyAMA0
 dtoverlay=miniuart-bt
-
-# enable autoprobing of Bluetooth driver without need of hciattach/btattach
-dtparam=krnbt=on

board/raspberrypi/config_4_64bit.txt

@@ -25,8 +25,5 @@ gpu_mem_1024=100
 # Enable UART0 for serial console on ttyAMA0
 dtoverlay=miniuart-bt
 
-# enable autoprobing of Bluetooth driver without need of hciattach/btattach
-dtparam=krnbt=on
-
 # enable 64bits support
 arm_64bit=1

board/raspberrypi/config_zero2w.txt

@@ -24,6 +24,3 @@ gpu_mem_1024=100
 
 # Enable UART0 for serial console on ttyAMA0
 dtoverlay=miniuart-bt
-
-# enable autoprobing of Bluetooth driver without need of hciattach/btattach
-dtparam=krnbt=on