kernel config: Enable usage of commandline from bootloader

* Allow usage of commandline from bootloader
* Adapt the default commandline:
** Remove earlyprintk, should be used for debug only

recipes-kernel/linux/linux-stable-5.4/defconfig

@@ -4,12 +4,11 @@
 #
 
 #
-# Compiler: arm-linux-gnueabihf-gcc (Debian 8.3.0-2) 8.3.0
+# Compiler: arm-guf-linux-gnueabi-gcc (GCC) 9.3.0
 #
 CONFIG_CC_IS_GCC=y
-CONFIG_GCC_VERSION=80300
+CONFIG_GCC_VERSION=90300
 CONFIG_CLANG_VERSION=0
-CONFIG_CC_CAN_LINK=y
 CONFIG_CC_HAS_ASM_GOTO=y
 CONFIG_CC_HAS_ASM_INLINE=y
 CONFIG_CC_HAS_WARN_MAYBE_UNINITIALIZED=y
@@ -144,7 +143,6 @@ CONFIG_CGROUPS=y
 CONFIG_RELAY=y
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_INITRAMFS_SOURCE=""
-# CONFIG_INITRAMFS_FORCE is not set
 CONFIG_RD_GZIP=y
 CONFIG_RD_BZIP2=y
 CONFIG_RD_LZMA=y
@@ -549,10 +547,10 @@ CONFIG_ARM_APPENDED_DTB=y
 CONFIG_ARM_ATAG_DTB_COMPAT=y
 CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER=y
 # CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND is not set
-CONFIG_CMDLINE="earlyprintk console=ttymxc0,115200 root=/dev/mmcblk1p3 rootflags=data=journal rootwait rootfstype=ext4 cma=128M"
-# CONFIG_CMDLINE_FROM_BOOTLOADER is not set
+CONFIG_CMDLINE="console=ttymxc0,115200 root=/dev/mmcblk1p3 rootflags=data=journal rootwait rootfstype=ext4 cma=128M"
+CONFIG_CMDLINE_FROM_BOOTLOADER=y
 # CONFIG_CMDLINE_EXTEND is not set
-CONFIG_CMDLINE_FORCE=y
+# CONFIG_CMDLINE_FORCE is not set
 CONFIG_KEXEC=y
 CONFIG_ATAGS_PROC=y
 # CONFIG_CRASH_DUMP is not set