arch/arm64: Remove unnecessary interfaces

<clocks.h> and smp_processor_id() aren't used anywhere anymore. Get rid
of them.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I1a8c892b066e6ac0e7cec5316633d44165344e78
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57819
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/arch/arm64/include/armv8/arch/cpu.h

@@ -5,8 +5,6 @@
 
 #define asmlinkage
 
-static inline unsigned int smp_processor_id(void) { return 0; }
-
 struct cpu_driver { };
 
 #endif /* __ARCH_CPU_H__ */

src/arch/arm64/include/clocks.h

@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-/* Standard clock speeds */
-
-/*
- * We define some commonly-used clock speeds to avoid error since long
- * numbers are hard to read.
- *
- * The format of the label is
- * CLK_x_yU where:
- *	x is the integer speed
- *	y is the fractional part which can be omitted if 0
- *	U is the units (blank for Hz, K or M for KHz and MHz)
- *
- * Please order the items by increasing Hz
- */
-enum {
-	CLK_32768	= 32768,
-	CLK_20M		= 20000000,
-	CLK_24M		= 24000000,
-	CLK_144M	= 144000000,
-	CLK_216M	= 216000000,
-	CLK_300M	= 300000000,
-};