cros_ec: Sync ec_commands.h from upstream Chrome OS EC

Sync include/ec_commands.h from upstream commit 4f3d17aa34
("skywalker: set SLEEP_TIMEOUT_MS to 50 seconds"). The new file makes
two build assumptions that do not hold for U-Boot.

It hides '<stdint.h>' from __KERNEL__ builds, leaving UINT16_MAX
(used by EC_RES_MAX) undefined for U-Boot; widen the gate to
'!defined(__KERNEL__) || defined(__UBOOT__)'

It gates '<linux/limits.h>' on '#ifdef __KERNEL__'; the matching
'#else' branch defines BIT()/BIT_ULL()/GENMASK()/GENMASK_ULL()
locally, assuming kernel headers provide those macros otherwise.
U-Boot defines __KERNEL__ too but has no <linux/limits.h>. Nest a
'!defined(__UBOOT__)' check around the include so the __UBOOT__ path
stays in the __KERNEL__ branch (no local BIT/GENMASK defines), which
avoids redefinition warnings against U-Boot's linux/bitops.h. Pull
in linux/bitops.h up front for U-Boot so the file's own BIT() and
GENMASK() uses still resolve.

Adapt callers to two interface changes. The 'ec_current_image' enum
tag is now 'ec_image' (EC_IMAGE_* constants unchanged); rename it in
affected files to match. The VBNV-context interface was dropped
upstream, but it still used in lab Chromebooks; keep those constants and
structs in cros_ec.h

Likewise, MEC_EMI_BASE and MEC_EMI_SIZE are a U-Boot-local addition to
ec_commands.h that the upstream sync removes; preserve them in cros_ec.h
next to the VBNV block, and switch the only consumer
(arch/x86/cpu/apollolake/cpu_spl.c) to include cros_ec.h

Signed-off-by: Simon Glass <[email protected]>

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