ec/google/chromeec: Update ec_commands.h

Copy ec_commands.h directly from ChromiumOS EC repository (CL:1520574).

Since ec_commands.h already defines usb_charge_mode and only
USB_CHARGE_MODE_DISABLED is used in coreboot, enum usb_charge_mode is
removed from ec.h.

To avoid redefinition of the BIT macro, #ifndef check is added to
include/types.h.

BUG=b:109900671,b:118654976
BRANCH=none
TEST=emerge-kukui -j coreboot

Change-Id: I7ed5344fc8923e45e17c3e2a34371db6f80b079d
Signed-off-by: You-Cheng Syu <youcheng@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31885
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/types.h

@@ -25,7 +25,9 @@
  * from the MSB (e.g. PowerPC), but until we cross that bridge, this macro is
  * perfectly fine.
  */
+#ifndef BIT
 #define BIT(x)				(1ul << (x))
+#endif
 
 /**
  * coreboot error codes