setexpr: Add explicit support for 32- and 64-bit ints

At present this function assumes that a size of 4 refers to a ulong. This
is true on 32-bit machines but not commonly on 64-bit machines.

This means that the 'l' specify does not work correctly with setexpr.

Add an explicit case for 32-bit values so that 64-bit machines can still
use the 'l' specifier. On 32-bit machines, 64-bit is still not supported.

This corrects the operation of the default size (which is 4 for setexpr),
so update the tests accordingly.

The original code for reading from memory was included in 47ab5ad145
("cmd_setexpr: allow memory addresses in expressions") but I am not adding
a Fixes: tag since that code was not written with 64-bit machines in mind.

Signed-off-by: Simon Glass <sjg@chromium.org>

cmd/setexpr.c

@@ -39,6 +39,10 @@ static ulong get_arg(char *s, int w)
 			unmap_sysmem(p);
 			return val;
 		case 4:
+			p = map_sysmem(addr, sizeof(u32));
+			val = *(u32 *)p;
+			unmap_sysmem(p);
+			return val;
 		default:
 			p = map_sysmem(addr, sizeof(ulong));
 			val = *p;