sdhci: Initial support for the SpacemiT K1 sdhci controller

[bnovkov]

Test Plan

Tested on a Banana Pi BPI-F3 board, the driver successfully attaches to the SD card :

[[snip]]
sdhci_spacemit0: <SpacemiT K1 SDHCI controller> mem 0xd4280000-0xd42801ff irq 43 on simplebus6
sdhci_spacemit0-slot0: Hardware doesn't specify timeout clock frequency, setting BROKEN_TIMEOUT quirk.
sdhci_spacemit0-slot0: 208MHz 8bits VDD: VCCQ: 3.3V DRV: BACD DMA removable
sdhci_spacemit0-slot0: ============== REGISTER DUMP ==============
sdhci_spacemit0-slot0: Sys addr: 0x00000000 | Version:  0x00000002
sdhci_spacemit0-slot0: Blk size: 0x00007040 | Blk cnt:  0x00000000
sdhci_spacemit0-slot0: Argument: 0x80fffff1 | Trn mode: 0x00000013
sdhci_spacemit0-slot0: Present:  0x01f70000 | Host ctl: 0x0000001e
sdhci_spacemit0-slot0: Power:    0x0000000f | Blk gap:  0x00000000
sdhci_spacemit0-slot0: Wake-up:  0x00000000 | Clock:    0x00000307
sdhci_spacemit0-slot0: Timeout:  0x0000000e | Int stat: 0x00000000
sdhci_spacemit0-slot0: Int enab: 0x027f003b | Sig enab: 0x027f003b
sdhci_spacemit0-slot0: AC12 err: 0x00000000 | Host ctl2:0x00004008
sdhci_spacemit0-slot0: Caps:     0x35fc0080 | Caps2:    0x00002f77
sdhci_spacemit0-slot0: Max curr: 0x00000000 | ADMA err: 0x00000000
sdhci_spacemit0-slot0: ADMA addr:0x7deb234c | Slot int: 0x00000000
sdhci_spacemit0-slot0: ===========================================
sdhci_spacemit0: 1 slot(s) allocated
sdhci_spacemit0-slot0: Card inserted
mmc0: <MMC/SD bus> on sdhci_spacemit0
[[snip]]

[mhorne]

sys/dev/sdhci/sdhci_fdt_spacemit.c

12

Please double check the includes, the list seems like more than necessary. Certainly taskqueue.h is not needed here, at the very least.