riscv: show registers in crash dumps by default

If an exception occurs in main U-Boot, show the registers. This makes
analyzing crashes especially in external applications easier.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index fd1f5f8..876bec3 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -438,6 +438,7 @@
 	  If disable this, it will send IPI by CPUs node numbers of device tree.
 
 config SHOW_REGS
+	default y
 	bool "Show registers on unhandled exception"
 	help
 	  By default only the program counter and the return address register