spi: stm32: rename STM32 SPI registers to STM32H7

Rename STM32 SPI registers to be related to STM32H7 SPI driver
and not STM32 generally.

Signed-off-by: Cezary Gapinski <cezary.gapinski@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed