linux/linux: fix firmware-imx dependency

Commit 666084f4943773fd659393e16982ab2baaa99d0e ("linux:linux.mk: Add
"firmware-imx" dependency if needed") introduced a dependency from
linux to firmware-imx, but based on the incorrect BR2 option.

This commit fixes this mistake.

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 0276a6fccfd738914767c56bebe5dc8bb9342b6c)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

linux/linux.mk

@@ -77,7 +77,7 @@ LINUX_DEPENDENCIES = host-kmod
 LINUX_DEPENDENCIES += \
 	$(if $(BR2_PACKAGE_INTEL_MICROCODE),intel-microcode) \
 	$(if $(BR2_PACKAGE_LINUX_FIRMWARE),linux-firmware) \
-	$(if $(BR2_PACKAGE_FREESCALE_IMX),firmware-imx) \
+	$(if $(BR2_PACKAGE_FIRMWARE_IMX),firmware-imx) \
 	$(if $(BR2_PACKAGE_WIRELESS_REGDB),wireless-regdb)
 
 # Starting with 4.16, the generated kconfig paser code is no longer