ARM: dts: aspeed: romed8hm3: Fix GPIOB0 name

This GPIO was mislabeled as DDR_MEM_TEMP in the schematic; after a
correction from ASRock Rack its name now reflects its actual
functionality (POST_COMPLETE_N).
Signed-off-by: NZev Weiss <zev@bewilderbeest.net>
Fixes: a9a3d60b ("ARM: dts: aspeed: Add ASRock ROMED8HM3 BMC")
Reviewed-by: NJoel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20220331022425.28606-2-zev@bewilderbeest.netSigned-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-asrock-romed8hm3.dts

@@ -198,7 +198,7 @@
 	gpio-line-names =
 		/*  A */ "LOCATORLED_STATUS_N", "BMC_MAC2_INTB", "NMI_BTN_N", "BMC_NMI",
 			"", "", "", "",
-		/*  B */ "DDR_MEM_TEMP", "", "", "", "", "", "", "",
+		/*  B */ "POST_COMPLETE_N", "", "", "", "", "", "", "",
 		/*  C */ "", "", "", "", "PCIE_HP_SEL_N", "PCIE_SATA_SEL_N", "LOCATORBTN", "",
 		/*  D */ "BMC_PSIN", "BMC_PSOUT", "BMC_RESETCON", "RESETCON",
 			"", "", "", "PSU_FAN_FAIL_N",