arch: riscv: remode redundant soc.h includes

They are just not needed.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

include/zephyr/arch/riscv/arch.h

@@ -26,7 +26,6 @@
 #endif /* CONFIG_USERSPACE */
 #include <zephyr/irq.h>
 #include <zephyr/sw_isr_table.h>
-#include <soc.h>
 #include <zephyr/devicetree.h>
 #include <zephyr/arch/riscv/csr.h>
 #include <zephyr/arch/riscv/exception.h>

include/zephyr/arch/riscv/common/linker.ld

@@ -11,7 +11,6 @@
  * Generic Linker script for the riscv platform
  */
 
-#include <soc.h>
 #include <zephyr/devicetree.h>
 
 #include <zephyr/linker/sections.h>

include/zephyr/arch/riscv/irq.h

@@ -22,7 +22,6 @@ extern "C" {
 #include <zephyr/irq.h>
 #include <zephyr/sw_isr_table.h>
 #include <stdbool.h>
-#include <soc.h>
 #endif /* !_ASMLANGUAGE */
 
 /* Exceptions 0-15 (MCAUSE interrupt=0) */