Fix EC build for latest llvm
Fix EC build for latest llvm

BRANCH=none

util/ectool.c:1158 merror: taking address of packed member 'size' of class
or structure 'ec_params_usb_pd_fw_update' may result in an unaligned
pointer value [-Werror,-Waddress-of-packed-member]

For this case, the pointer is always aligned but clang complains.
Workaround using double pointer casts to char and uint.

       uint32_t *data = &(p->size) + 1;

BUG=chromium:665240
TEST=Builds now

Change-Id: Ibccf0f6e409b9724fc9e5acf28dde570e9d341e3
Reviewed-on: https://chromium-review.googlesource.com/411384
Commit-Ready: Manoj Gupta <1d49d0f302d724a1dc5fc4d717d15418e9808ddd@chromium.org>
Tested-by: Manoj Gupta <1d49d0f302d724a1dc5fc4d717d15418e9808ddd@chromium.org>
Reviewed-by: Yunlian Jiang <8ca9e07d8da722742b3f5a8340e0afab8cf1248e@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec