chip/npcx: Disable linker section check warning
chip/npcx: Disable linker section check warning

When linking with clang (lld), it complains that the .header and .text
virtual memory address (VMA) overlaps:

ld.lld: error: section .header virtual address range overlaps with .text
>>> .header range is [0x10070000, 0x1007003F]
>>> .text range is [0x10070000, 0x10095DDB]

However, in this case it appears that it's ok that the header overlaps
with the text section, since the bootloader uses the header to copy the
firmware from flash to RAM (the header itself is not copied).

BRANCH=none
BUG=b:172020503
TEST=CC=clang make BOARD=elemi
TEST=./util/compare_build.sh -b all -j 120
     => MATCH

Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Change-Id: Ic2a7058c85bbcb90c69d2b372f6d33930ac4d212
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3207346
Reviewed-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>

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