ARM: i.MX8M: support saving BootROM event log before clobbering OCRAM

The ROM event log[1] is a data structure populated by the i.MX BootROM
on i.MX6 and later. It's found by dereferencing a 32-bit address at a
fixed location within the BootROM. If valid, this address will point
into the On-Chip SRAM. On the i.MX8M, we load the ARM trusted firmware
into the On-Chip SRAM and may end up overwriting the BootROM event log,
before the user has a chance to parse it. Thus save the BootROM log into
the newly defined i.MX scratch space for later usage.

[1]: NXP AN12853 "i.MX ROMs Log Events" Rev. 0 -  May 2020

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20221101180643.244270-5-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

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