Provide the kernel_text symbol for the benfit of sys/kern/subr_prof.c

Author: skrll

sys/arch/riscv/conf/kern.ldscript

@@ -1,4 +1,4 @@
-/*	$NetBSD: kern.ldscript,v 1.8 2021/05/01 07:13:21 skrll Exp $	*/
+/*	$NetBSD: kern.ldscript,v 1.9 2026/03/18 10:02:29 skrll Exp $	*/
 
 #include "assym.h"
 
@@ -14,6 +14,7 @@ SECTIONS
 	.text : AT (KERNEL_PHYS)
 	{
 		PROVIDE(__kernel_text = .);
+		PROVIDE(kernel_text = .);
 		*(.text)
 		*(.text.*)
 		*(.stub)