plugins/amt: Move UUID_LE initialisation into function scope
plugins/amt: Move UUID_LE initialisation into function scope

This should hopefully fix the error:

../../checkout/fwupd/plugins/amt/fu-plugin-amt.c:238:1: error: initializer element is not constant
 uuid_le MEI_IAMTHIF = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d,  \
 ^

Signed-off-by: Philip Withnall <29c2a2ac2a854b9cf047275aa9de346d096be2e0@endlessm.com>

fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,vathpela/fwupd,vathpela/fwupd,vathpela/fwupd,fwupd/fwupd,superm1/fwupd,superm1/fwupd,superm1/fwupd,hughsie/fwupd,fwupd/fwupd,vathpela/fwupd