Add initial support of STM32MP13 family. The STM32MP13 SoC diversity is
composed by:
-STM32MP131:
  -core: 1*CA7, 17*TIMERS, 5*LPTIMERS, DMA/MDMA/DMAMUX
  -storage: 3*SDMCC, 1*QSPI, FMC
  -com: USB (OHCI/EHCI, OTG), 5*I2C, 5*SPI/I2S, 8*U(S)ART
  -audio: 2*SAI
  -network: 1*ETH(GMAC)
-STM32MP133: STM32MP131 + 2*CAN, ETH2(GMAC), ADC1
-STM32MP135: STM32MP133 + DCMIPP, LTDC

A second diversity layer exists for security features:
-STM32MP13xY, "Y" gives information:
 -Y = A/D means no cryp IP and no secure boot.
 -Y = C/F means cryp IP + secure boot.

This commit adds basic peripheral.
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>