watchdog: rzv2h: Improve error strings and add newlines

watchdog: rzv2h: Improve error strings and add newlines

Update rzv2h_wdt_probe() to provide clearer error strings when retrieving
the pclk, oscclk, and reset controller, and append missing newline
characters to dev_err_probe() and dev_warn() calls for proper log
formatting.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>