cmd: add exception command

The 'exception' command allows to test exception handling.

This implementation supports ARM, x86, RISC-V and the following exceptions:
* 'breakpoint' - prefetch abort exception (ARM 32bit only)
* 'unaligned'  - data abort exception (ARM only)
* 'undefined'  - undefined instruction exception

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/cmd/x86/Makefile b/cmd/x86/Makefile
index bcc6d06..7071614 100644
--- a/cmd/x86/Makefile
+++ b/cmd/x86/Makefile
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0+
 
 obj-y += mtrr.o
+obj-$(CONFIG_CMD_EXCEPTION) += exception.o
 obj-$(CONFIG_HAVE_FSP) += fsp.o