powerpc: T4240: Remove macro CONFIG_PPC_T4240

arch/powerpc/cpu/mpc85xx/Kconfig

arch/powerpc/cpu/mpc85xx/Makefile

arch/powerpc/cpu/mpc85xx/fdt.c

arch/powerpc/cpu/mpc85xx/speed.c

arch/powerpc/cpu/mpc85xx/t4240_serdes.c

arch/powerpc/include/asm/config_mpc85xx.h

arch/powerpc/include/asm/immap_85xx.h

configs/T4240QDS_NAND_defconfig

configs/T4240QDS_SDCARD_defconfig

configs/T4240QDS_SECURE_BOOT_defconfig

configs/T4240QDS_SRIO_PCIE_BOOT_defconfig

configs/T4240QDS_defconfig

configs/T4240RDB_SDCARD_defconfig

configs/T4240RDB_defconfig

drivers/net/fm/Makefile

include/configs/T4240QDS.h

include/configs/T4240RDB.h

scripts/config_whitelist.txt