libplatsupport: separate drivers from platforms #257

Job	Run time
HW Build (armv7a, gcc)	20m 36s
HW Build (armv7a, clang)	22m 52s
HW Build (armv8a, gcc)	1h 3m 40s
HW Build (armv8a, clang)	1h 1m 14s
HW Build (nehalem, gcc)	9m 14s
HW Build (nehalem, clang)	11m 50s
HW Build (rv64imac, gcc)	6m 57s
Matrix	11s
HW Run (ZYNQMP106, armv8a, gcc)	41m 50s
HW Run (ZYNQMP106, armv8a, clang)	34m 55s
HW Run (IMX8MQ_EVK, armv8a, gcc)	36m 25s
HW Run (IMX8MQ_EVK, armv8a, clang)	30m 35s
HW Run (OMAP3, armv7a, gcc)	31m 23s
HW Run (OMAP3, armv7a, clang)	34m 50s
HW Run (ODROID_C4, armv8a, gcc)	55m 18s
HW Run (ODROID_C4, armv8a, clang)	43m 54s
HW Run (IMX8MM_EVK, armv8a, gcc)	1h 2m 38s
HW Run (IMX8MM_EVK, armv8a, clang)	55m 29s
HW Run (AM335X_BONEBLACK, armv8a, gcc)	25m 0s
HW Run (AM335X_BONEBLACK, armv8a, clang)	29m 57s
HW Run (ODROID_C2, armv8a, gcc)	18m 52s
HW Run (ODROID_C2, armv8a, clang)	14m 12s
HW Run (ODROID_XU4, armv7a, gcc)	59m 12s
HW Run (ODROID_XU4, armv7a, clang)	54m 47s
HW Run (TX1, armv8a, gcc)	1h 24m 32s
HW Run (TX1, armv8a, clang)	31s
HW Run (ZYNQMP, armv8a, gcc)	39m 48s
HW Run (ZYNQMP, armv8a, clang)	34m 17s
HW Run (SABRE, armv7a, gcc)	20m 55s
HW Run (SABRE, armv7a, clang)	21m 41s
HW Run (TK1, armv7a, gcc)	45m 4s
HW Run (TK1, armv7a, clang)	37m 28s
HW Run (TX2, armv8a, gcc)	1h 21m 25s
HW Run (TX2, armv8a, clang)	1h 4m 55s
HW Run (PC99, nehalem, gcc, 32)	33m 6s
HW Run (PC99, nehalem, clang, 32)	28m 27s
HW Run (PC99, nehalem, gcc, 64)	48m 36s
HW Run (PC99, nehalem, clang, 64)	28m 23s
HW Run (HIFIVE, rv64imac, gcc)	46m 51s
	1d 0h 1m 50s

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