spi: stm32: Add Serial Peripheral Interface driver for STM32MP

Add SPI driver support for STM32MP SoCs family.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2e5a248..98f5598 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -312,6 +312,7 @@
 F:	drivers/misc/stm32_rcc.c
 F:	drivers/reset/stm32-reset.c
 F:	drivers/spi/stm32_qspi.c
+F:	drivers/spi/stm32_spi.c
 F:	drivers/watchdog/stm32mp_wdt.c
 
 ARM STM STV0991