net: dsa: microchip: Fix log typo in error path

All other log messages in the driver prefix hex values with 0x, add it
in the one missing message. While at it also add the missing opening
parenthesis in the same log message.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260722174853.2316333-1-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Jakub Kicinski <kuba@kernel.org>