fbdev: pm[23]fb.c: fix -Wextra build warnings and errors

When 'DEBUG' is not defined, modify the DPRINTK() macro to use the
no_printk() macro instead of using <empty>.
This fixes build warnings when -Wextra is used and provides
printk format checking:

../drivers/video/fbdev/pm2fb.c:227:38: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
../drivers/video/fbdev/pm3fb.c:1039:33: warning: suggest braces around empty body in an ‘else’ statement [-Wempty-body]

Also drop one argument in two DPRINTK() macro uses to provide the
correct number of arguments and use the correct field in one case
to fix a build error:

../drivers/video/fbdev/pm3fb.c:353:9: error: ‘struct fb_info’ has no member named ‘current_par’
     info->current_par->depth);

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200315041002.24473-6-rdunlap@infradead.org

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