Fix following bootup crash on LDP platform by enabling T2 USB driver for MUSB

Backtrace:
[<c001b9ac>] (musb_platform_init+0x0/0x120) from [<c001b0a8>] (musb_probe+0x208/0xb0c)
 r5:00000000 r4:c0222ad4
[<c001aea0>] (musb_probe+0x0/0xb0c) from [<c0142e80>] (platform_drv_probe+0x20/0x24)
[<c0142e60>] (platform_drv_probe+0x0/0x24) from [<c0142118>] (driver_probe_device+0xd0/0x17c)
[<c0142048>] (driver_probe_device+0x0/0x17c) from [<c0142210>] (__driver_attach+ 0x4c/0x70)
 r7:c0233214 r6:c0233214 r5:c02229ec r4:c0222940
[<c01421c4>] (__driver_attach+0x0/0x70) from [<c0141790>] (bus_for_each_dev+0x4c/0x84)
 r7:c0233214 r6:c01421c4 r5:c781de94 r4:00000000
[<c0141744>] (bus_for_each_dev+0x0/0x84) from [<c0141f60>] (driver_attach+0x20/0x28)
 r7:c78999c0 r6:c0234c60 r5:c0233214 r4:00000000
[<c0141f40>] (driver_attach+0x0/0x28) from [<c0141c1c>] (bus_add_driver+0xa8/0x214)
[<c0141b74>] (bus_add_driver+0x0/0x214) from [<c0142404>] (driver_register+0x98/0x120)
 r8:00000000 r7:00000000 r6:c0234c60 r5:c0233214 r4:c001e5c4
[<c014236c>] (driver_register+0x0/0x120) from [<c014303c>] (platform_driver_register+0x78/0x94)
[<c0142fc4>] (platform_driver_register+0x0/0x94) from [<c0143070>] (platform_driver_probe+0x18/0x68)
[<c0143058>] (platform_driver_probe+0x0/0x68) from [<c001ad38>] (musb_init+0x3c/0x54)
 r5:c001e510 r4:c001e5c4
[<c001acfc>] (musb_init+0x0/0x54) from [<c0022298>] (__exception_text_end+0x50/0x168)
Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Acked-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>