test: print: Fix hexdump test on 64bit systems

Use the following regex to make this test compatible with
both 32bit and 64bit systems. The trick is to use %0*lx
format string for the address prefix in the test.

"
s@\(ut_assert_nextline("\)0\+\([^:]\+\)\(:.*"\)\();\)@\1%0*lx\3, IS_ENABLED(CONFIG_PHYS_64BIT) ? 16 : 8, 0x\2UL\4
"

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Simon Glass <sjg@chromium.org>