soc/amd/common/block/espi: Increase ESPI_CH_READY_TIMEOUT_US to 10ms

The ChromeEC might take longer than 1ms for the peripheral channel to be
enabled. The PLTRST# interrupt handler takes about ~539us.
This doesn't account for the time it takes for the interrupt handler
to be scheduled. Increasing the timeout to 10ms gives ample time.

BUG=b:188188172, b:188935533
TEST=Boot guybrush and no longer see channel enable errors

Suggested-by: Rob Barnes <robbarnes@google.com>
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ib6db577bf06175ceb17b446af706ad8c9f891481
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54788
Reviewed-by: Jason Glenesk <jason.glenesk@amd.corp-partner.google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/common/block/lpc/espi_util.c

@@ -371,7 +371,7 @@ enum espi_cmd_type {
 #define ESPI_RXVW_POLARITY			0xac
 
 #define ESPI_CMD_TIMEOUT_US			100
-#define ESPI_CH_READY_TIMEOUT_US		1000
+#define ESPI_CH_READY_TIMEOUT_US		10000
 
 union espi_txhdr0 {
 	uint32_t val;