ec/ite: Move e-flash signature to 0x80

According to the datasheet, the e-flash signature can be at any 16-byte
aligned address in 0x40-0xF0. Because of an address conflict with SDCC
4.5.0, move the signature to 0x80. This matches the address for Zephyr
RISC-V SoCs, like 82302.

Ref: zephyrproject-rtos/zephyr#36379
Signed-off-by: Tim Crawford <tcrawford@system76.com>

Author: crawfxrd

src/ec/ite/signature.c

@@ -4,13 +4,13 @@
 
 #if CONFIG_BUS_ESPI
 // eSPI signature (byte 7 = 0xA4)
-static __code const uint8_t __at(0x40) SIGNATURE[16] = {
+static __code const uint8_t __at(0x80) SIGNATURE[16] = {
     0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0xA4, 0x95,
     0x85, 0x12, 0x5A, 0x5A, 0xAA, 0x00, 0x55, 0x55,
 };
 #else // CONFIG_BUS_ESPI
 // LPC signature (byte 7 = 0xA5)
-static __code const uint8_t __at(0x40) SIGNATURE[16] = {
+static __code const uint8_t __at(0x80) SIGNATURE[16] = {
     0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0x94,
     0x85, 0x12, 0x5A, 0x5A, 0xAA, 0x00, 0x55, 0x55,
 };