ARM: renesas: Simplify weak symbols

Simplify the weak symbols use in cpu_info.c by using the __weak macro.
The result is identical, but the syntax is much simpler. Furthermore,
drop three more rmobile* symbols which are now unused.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Paul Barker <paul.barker.ct@bp.renesas.com>
diff --git a/arch/arm/mach-rmobile/cpu_info.c b/arch/arm/mach-rmobile/cpu_info.c
index 66ac6b3..2f9a437 100644
--- a/arch/arm/mach-rmobile/cpu_info.c
+++ b/arch/arm/mach-rmobile/cpu_info.c
@@ -36,26 +36,20 @@
 	return 0;
 }
 
-static u32 __rmobile_get_cpu_type(void)
+__weak u32 renesas_get_cpu_type(void)
 {
 	return 0x0;
 }
-u32 renesas_get_cpu_type(void)
-		__attribute__((weak, alias("__rmobile_get_cpu_type")));
 
-static u32 __rmobile_get_cpu_rev_integer(void)
+__weak u32 renesas_get_cpu_rev_integer(void)
 {
 	return 0;
 }
-u32 renesas_get_cpu_rev_integer(void)
-		__attribute__((weak, alias("__rmobile_get_cpu_rev_integer")));
 
-static u32 __rmobile_get_cpu_rev_fraction(void)
+__weak u32 renesas_get_cpu_rev_fraction(void)
 {
 	return 0;
 }
-u32 renesas_get_cpu_rev_fraction(void)
-		__attribute__((weak, alias("__rmobile_get_cpu_rev_fraction")));
 
 /* CPU information table */
 static const struct {