Merge changes from topic "yg/clk_syscfg_dt" into integration

Merge changes from topic "yg/clk_syscfg_dt" into integration

* changes:
  fdts: stm32mp1: realign device tree files with internal devs
  stm32mp1: increase device tree size to 20kB
  stm32mp1: make dt_get_stdout_node_offset() static
  stm32mp1: use unsigned values for SDMMC defines
  stm32mp1: remove useless LIBFDT_SRCS from PLAT_BL_COMMON_SOURCES
  stm32mp1: update doc for U-Boot compilation
  stm32mp1: add general SYSCFG management
  stm32mp1: move stm32_get_gpio_bank_clock() to private file
  clk: stm32mp1: correctly handle Clock Spreading Generator
  clk: stm32mp1: use defines for mask values in stm32mp1_clk_sel array
  clk: stm32mp1: move oscillator functions to generic file
  arch: add some defines for generic timer registers