[TF-A] [REGRESSION] v2.7-rc0 broken for STM32MP boards: lxa-mc1, avenger96, odyssey

Hello Yann, Hello Pascal,

I've tried booting v2.7-rc0 on the lxa-mc1 and TF-A panics:

NOTICE: CPU: STM32MP157C?? Rev.B NOTICE: Model: Linux Automation MC-1 board ERROR: regul ldo3: max value 750 is invalid PANIC at PC : 0x2ffeebb7

because the driver takes great offense at the content of the device tree. The parts in question were copy-pasted from ST DTs, but those ST DTs were fixed by commit 67d95409baae ("refactor(stm32mp1-fdts): update regulator description").

I can understand ST hesistancy to touch device trees of 'unofficial' boards, but I would appreciate that new features then, such as this regulator sanity checking, be made optional and off by default to not needlessly break other boards.

Thanks, Ahmad