Move board-info props to vendor/build.prop

This change moves the ro.build.require.* props extracted from
TARGET_BOARD_INFO_FILE to vendor/build.prop as opposed to
system/build.prop. These typically contain what bootloader and
baseband the build requires, which are very device-specific.

Bug: 130025216
Test: make, inspect props
Test: flash blueline
Change-Id: I48642485bdc853884d465d1fe00f2ceae69a4736
Merged-In: I48642485bdc853884d465d1fe00f2ceae69a4736