amd/stoneyridge: Rename ramtop.c to memmap.c

Use a name consistent with the more recent soc/intel.

Change-Id: I4d67a7c3107758c81a67e1668875767beccfcdb0
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34879
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/stoneyridge/Makefile.inc

@@ -62,7 +62,7 @@ romstage-y += pmutil.c
 romstage-y += reset.c
 romstage-y += smbus.c
 romstage-y += smbus_spd.c
-romstage-y += ramtop.c
+romstage-y += memmap.c
 romstage-$(CONFIG_STONEYRIDGE_UART) += uart.c
 romstage-y += tsc_freq.c
 romstage-y += southbridge.c
@@ -82,7 +82,7 @@ verstage-$(CONFIG_SPI_FLASH) += spi.c
 
 postcar-y += monotonic_timer.c
 postcar-$(CONFIG_STONEYRIDGE_UART) += uart.c
-postcar-y += ramtop.c
+postcar-y += memmap.c
 postcar-y += nb_util.c
 postcar-$(CONFIG_VBOOT_MEASURED_BOOT) += i2c.c
 postcar-y += tsc_freq.c
@@ -103,7 +103,7 @@ ramstage-y += reset.c
 ramstage-y += sata.c
 ramstage-y += sm.c
 ramstage-y += smbus.c
-ramstage-y += ramtop.c
+ramstage-y += memmap.c
 ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smi.c
 ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smi_util.c
 ramstage-$(CONFIG_STONEYRIDGE_UART) += uart.c