libplatsupport: separate drivers from platforms #277

Job	Run time
HW Build (armv7a, gcc)	14m 22s
HW Build (armv7a, clang)	17m 0s
HW Build (armv8a, gcc)	45m 30s
HW Build (armv8a, clang)	51m 23s
HW Build (nehalem, gcc)	6m 43s
HW Build (nehalem, clang)	9m 27s
HW Build (rv64imac, gcc)	5m 17s
HW Build (rv64imac, clang)	5m 17s
Matrix	11s
HW Run (SABRE, armv7a, gcc)	21m 19s
HW Run (SABRE, armv7a, clang)	22m 58s
HW Run (AM335X_BONEBLACK, armv8a, gcc)	27m 16s
HW Run (AM335X_BONEBLACK, armv8a, clang)	30m 17s
HW Run (ZYNQMP, armv8a, gcc)	39m 35s
HW Run (ZYNQMP, armv8a, clang)	30m 45s
HW Run (ODROID_C2, armv8a, gcc)	19m 4s
HW Run (ODROID_C2, armv8a, clang)	15m 55s
HW Run (IMX8MQ_EVK, armv8a, gcc)	37m 5s
HW Run (IMX8MQ_EVK, armv8a, clang)	27m 50s
HW Run (TQMA8XQP1GB, armv8a, gcc)	51m 29s
HW Run (TQMA8XQP1GB, armv8a, clang)	44m 5s
HW Run (OMAP3, armv7a, gcc)	38m 4s
HW Run (OMAP3, armv7a, clang)	34m 20s
HW Run (ZYNQMP106, armv8a, gcc)	41m 50s
HW Run (ZYNQMP106, armv8a, clang)	35m 41s
HW Run (ODROID_C4, armv8a, gcc)	56m 25s
HW Run (ODROID_C4, armv8a, clang)	46m 49s
HW Run (ODROID_XU4, armv7a, gcc)	59m 20s
HW Run (ODROID_XU4, armv7a, clang)	56m 38s
HW Run (TK1, armv7a, gcc)	42m 30s
HW Run (TK1, armv7a, clang)	46m 21s
HW Run (PC99, nehalem, gcc, 32)	55m 28s
HW Run (PC99, nehalem, clang, 32)	26m 40s
HW Run (PC99, nehalem, gcc, 64)	30m 10s
HW Run (PC99, nehalem, clang, 64)	46m 28s
HW Run (TX1, armv8a, gcc)	3h 6m 54s
HW Run (TX1, armv8a, clang)	2h 41m 6s
HW Run (TX2, armv8a, gcc)	1h 21m 1s
HW Run (TX2, armv8a, clang)	1h 6m 25s
HW Run (HIFIVE, rv64imac, gcc)	1h 43m 4s
HW Run (HIFIVE, rv64imac, clang)	2h 13m 50s
	1d 7h 11m 52s

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