brcm63xx: rename target to bcm63xx

This change makes the names of Broadcom targets consistent by using
the common notation based on SoC/CPU ID (which is used internally
anyway), bcmXXXX instead of brcmXXXX.
This is even used for target TITLE in make menuconfig already,
only the short target name used brcm so far.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/bcm63xx/patches-4.14/310-cfe_simplify_detection.patch

@@ -0,0 +1,20 @@
+--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_board.h
++++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_board.h
+@@ -2,6 +2,8 @@
+ #ifndef BCM63XX_BOARD_H_
+ #define BCM63XX_BOARD_H_
+ 
++#include <asm/bootinfo.h>
++
+ const char *board_get_name(void);
+ 
+ void board_prom_init(void);
+@@ -10,4 +12,8 @@ void board_setup(void);
+ 
+ int board_register_devices(void);
+ 
++static inline bool bcm63xx_is_cfe_present(void) {
++	return fw_arg3 == 0x43464531;
++}
++
+ #endif /* ! BCM63XX_BOARD_H_ */