ARM: prevent compiler warnings from bootm.c

Without preceding declarations, "make C=1" generates
"Should it be static?" warnings for symbols
	do_bootm_linux,
	boot_prep_vxworks, and
	boot_jump_vxworks

Include of bootm.h also identified a signature mismatch
(const on argv[]).

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
oc: use common get_board_rev()

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
ARM: i.MX6: include prototype for get_board_rev()

Include <asm/bootm.h> to see the prototype for get_board_rev()
and prevent warning "Should it be static?" with "make C=1".

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
fsl/usb: provide declaration for board_ehci_power() callback

Without this, board files providing the routine will generate
"Should it be static?" warnings with "make C=1".

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
a: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
bt: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
cad: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
dash: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
h: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
mcs: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
med: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
mtp: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
mx6_r: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nit6xlite: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nitrogen6_max: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nitrogen6x: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nw: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
oc: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
per: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
sp: prevent warnings about board_ehci* callbacks

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>