ARM: dts: msm: Correct the spmi core size for SM6150

Currently spmi core size is defined as 0x2300, which can lead to
the buffer overflow if the desired APID is not found. Fix it for
SM6150 and sdmmagpie.

Change-Id: I58e5f0786ab61550ef1e7a97219b4e9fe1ef0e99
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>