Use different versions for framework compatibility matrix

Keyed on MATRIX_LEVEL_OVERRIDE, FULL_TREBLE, SHIPPING_API_LEVEL,
and SDK_VERSION.

Bug: 62136051

Test: m system_compatibility_matrix.xml -j; \
    grep -e"gatekeeper" -B1 $OUT/system/compatibility_matrix.xml; \
    grep -e"oemlock" -B1 $OUT/system/compatibility_matrix.xml
bullhead: gatekeeper is optional, no oemlock (legacy.xml)
marlin without COMP_LEVEL_OVERRIDE: gatekeeper is not optional,
        no oemlock (26.xml)
marlin with COMP_LEVEL_OVERRIDE: gatekeeper is not optional,
        oemlock exists (current.xml)
new devices with COMP_LEVEL_OVERRIDE: same as above.

Change-Id: I2ccfa9b0132bf98cc2da8f0500bea992b5fa83d0