uboot-imx

MA-15062 change MACRO name of mcu TCM base address

imx-regs-imx8mm.h is used both for imx8mm and imx8mn, while mcu in
imx8mn is Cortex-M7, it's different from Cortex-M4 in imx8mm, change
the MACRO name of mcu TCM base address from M4_BOOTROM_BASE_ADDR to
MCU_BOOTROM_BASE_ADDR.
since this MACRO will be used in common code for i.MX chips, the same
MACRO name in other files are also modified.

Change-Id: I433dd78d11c485d0f4cb82bab299f61cb29dce45
Signed-off-by: faqiang.zhu <faqiang.zhu@nxp.com>