dt-bindings: firmware: qcom,scm: Add minidump SRAM property

On Qualcomm SoCs that support minidump, a word in always-on SRAM
is shared between the Operating System(HLOS) and boot firmware.
OS is expected to select the minidump download destination
either USB upload to a host PC or save to on-device storage.
Boot firmware will reads this word before DDR is initialized
on the warm reset following a crash to decide where to deliver
the minidump.

Add a 'sram' property to the SCM binding to allow the OS to
identify this SRAM region via a phandle.

Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20260624190830.3131112-2-mukesh.ojha@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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