link type of recovery variant of a vendor module should not be native:vendor

This CL fixes a bug that when a module is configured as 'vendor: true' &&
'recovery_available: true', the link type of the recovery variant of the
module is incorrectly set to 'native:vendor'. This was because,
androidmk.go emits 'LOCAL_PROPRIETARY_MODULE := true' whenever
Proprietary property is set to true, regardless of whether it is a
recovery variant or not. This in turn makes LOCAL_USE_VNDK := true for
the module which in turn causes the link type to be 'native:vendor'.

Fixing the bug by resetting the properties like Proprietary, Vendor,
Soc_specific, etc. for the recovery variants.

Bug: 113277544
Test: m -j (test added)
Change-Id: I5d6ae76e46ef8fcd9204d386d0809862a7b0ff7e