Remove sharding support from make

Sharding is not used in make any more, the large java modules
(libcore and framework) have moved to Soong.  Keeping sharding
support complicates java compiling, so remove it.

Bug: 73885582
Test: m checkbuild
Change-Id: I2932f9e96bfc8f2ebf82095b16d6c0b3c51613f0