ARM: dts: msm: Remove IPA and GPU memory region in sdm670

Remove IPA FW, IPA GSI and GPU micro-code carveout memory regions from
sdm670 memory map since they are not used.

Change-Id: I4eb785673d7540f1aec51ac8b9e9fb9362649820
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>