feat(stm32mp21): add RCC registers file

Add stm32mp21_rcc.h file which describes RCC peripheral registers
for STM32MP21.

Change-Id: Idd01179da3925aa4d7b4f934ebd3d95fc0780f6d
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@foss.st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
1 file changed