package/rpi-wifi-firmware: bump version to 883b726

Changelog:
  - Update CYW43455 bluetooth firmware,
    Second Spectra fix for CYW43455 (CVE-2020-10370)

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/rpi-wifi-firmware/rpi-wifi-firmware.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  ae665baa465a09dddf7f4bdec67e108a74b2a3787550cc9ee53c2bea9651f327  rpi-wifi-firmware-4c47758bed7cd547dff3618a1739dcf64b5a52a7.tar.gz
+sha256  0e7fcfe75a8990815a184dc55f8fdf5d0644d351a15a7aef865ff90ff4ca8eb4  rpi-wifi-firmware-883b72628de1d7efa45b421da0cbf175ac2374f8.tar.gz
 sha256  b16056fc91b82a0e3e8de8f86c2dac98201aa9dc3cbd33e8d38f1b087fcec30d  LICENCE.broadcom_bcm43xx

package/rpi-wifi-firmware/rpi-wifi-firmware.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-RPI_WIFI_FIRMWARE_VERSION = 4c47758bed7cd547dff3618a1739dcf64b5a52a7
+RPI_WIFI_FIRMWARE_VERSION = 883b72628de1d7efa45b421da0cbf175ac2374f8
 RPI_WIFI_FIRMWARE_SITE = $(call github,LibreELEC,brcmfmac_sdio-firmware-rpi,$(RPI_WIFI_FIRMWARE_VERSION))
 RPI_WIFI_FIRMWARE_LICENSE = PROPRIETARY
 RPI_WIFI_FIRMWARE_LICENSE_FILES = LICENCE.broadcom_bcm43xx