Revert "soc/amd/cpu: smbios: Set external clock to 100 MHz"

This reverts commit fe107c1ad2.

I have strong doubts that this is Glinda-specific, so this likely should
have been made common after verifying.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ib7282e2bec4d6aa5b74efa5621c825bc234cca82
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86689
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/glinda/cpu.c

@@ -7,16 +7,11 @@
 #include <cpu/amd/microcode.h>
 #include <cpu/cpu.h>
 #include <device/device.h>
-#include <smbios.h>
 #include <soc/cpu.h>
 
 _Static_assert(CONFIG_MAX_CPUS == 24, "Do not override MAX_CPUS. To reduce the number of "
 	"available cores, use the downcore_mode and disable_smt devicetree settings instead.");
 
-unsigned int smbios_processor_external_clock(void)
-{
-	return 100; // 100 MHz
-}
 static void zen_2_3_init(struct device *dev)
 {
 	check_mca();