mb/google/brya: Consistently put void before __weak attribute

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: Ic59cccdf0fb88fc71a440170ee40b73dd8736a33
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63178
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/google/brya/mainboard.c

@@ -59,12 +59,12 @@ void mainboard_update_soc_chip_config(struct soc_intel_alderlake_config *config)
 	variant_update_soc_chip_config(config);
 }
 
-__weak void variant_update_soc_chip_config(struct soc_intel_alderlake_config *config)
+void __weak variant_update_soc_chip_config(struct soc_intel_alderlake_config *config)
 {
 	/* default implementation does nothing */
 }
 
-__weak void variant_init(void)
+void __weak variant_init(void)
 {
 	/* default implementation does nothing */
 }