tidy ppc uart implementation #309

Job	Run time
build-lang	27s
build	1m 4s
build-debug (iopcore_debug)	1m 24s
build-debug (ingame_debug)	1m 11s
build-variants (RTL=0, PADEMU=0, IGS=0, DTL_T10000=0)	1m 9s
build-debug (eesio_debug)	1m 19s
build-variants (RTL=0, PADEMU=0, IGS=0, DTL_T10000=1)	1m 7s
build-debug (iopcore_ppctty_debug)	1m 15s
build-variants (RTL=0, PADEMU=0, IGS=1, DTL_T10000=0)	1m 12s
build-debug (ingame_ppctty_debug)	1m 14s
build-variants (RTL=0, PADEMU=0, IGS=1, DTL_T10000=1)	1m 12s
build-variants (RTL=0, PADEMU=1, IGS=0, DTL_T10000=0)	1m 7s
build-variants (RTL=0, PADEMU=1, IGS=0, DTL_T10000=1)	1m 9s
build-variants (RTL=0, PADEMU=1, IGS=1, DTL_T10000=0)	1m 8s
build-variants (RTL=0, PADEMU=1, IGS=1, DTL_T10000=1)	1m 7s
build-variants (RTL=1, PADEMU=0, IGS=0, DTL_T10000=0)	1m 3s
build-variants (RTL=1, PADEMU=0, IGS=0, DTL_T10000=1)	1m 19s
build-variants (RTL=1, PADEMU=0, IGS=1, DTL_T10000=0)	1m 4s
build-variants (RTL=1, PADEMU=0, IGS=1, DTL_T10000=1)	1m 3s
build-variants (RTL=1, PADEMU=1, IGS=0, DTL_T10000=0)	1m 7s
build-variants (RTL=1, PADEMU=1, IGS=0, DTL_T10000=1)	1m 9s
build-variants (RTL=1, PADEMU=1, IGS=1, DTL_T10000=0)	1m 4s
build-variants (RTL=1, PADEMU=1, IGS=1, DTL_T10000=1)	1m 7s
merge-debug	8s
merge-variants	14s
release	0s
	26m 23s

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