DO NOT MERGE: Fix incorrect min memory requirement for FWVGA size

the default display uses framebuffer resolutions up to qHD (e.g. FWVGA)
Minimum Memory and Storage (Section 7.6.1)
https://source.android.com/compatibility/8.1/android-8.1-cdd



Bug: 113096908
Test: cts-tradefed run cts-dev -m CtsHardwareTestCases --test android.hardware.cts.LowRamDeviceTest

Change-Id: I8818d89926a6beff1b0f4d5deec6c5ec5e1bde5d
Signed-off-by: Patrick Shi <patrick.shi@unisoc.com>