simplefb(4): display color depth when attaching

[Frederic Cambus]

Hi tech@,

Here is a diff to display color depth alongside resolution when
attaching simplefb(4).

Compile tested only, the only arm64 device I own is headless.

Comments? OK?

Index: sys/dev/fdt/simplefb.c
===================================================================
RCS file: /cvs/src/sys/dev/fdt/simplefb.c,v
retrieving revision 1.3
diff -u -p -r1.3 simplefb.c
--- sys/dev/fdt/simplefb.c      18 Dec 2017 10:13:45 -0000      1.3
+++ sys/dev/fdt/simplefb.c      29 Jul 2018 21:15:13 -0000
@@ -154,7 +154,7 @@ simplefb_attach(struct device *parent, s
                ri->ri_flg &= ~RI_CLEAR;
        }
 
-       printf(": %dx%d\n", ri->ri_width, ri->ri_height);
+       printf(": %dx%d, %dbpp\n", ri->ri_width, ri->ri_height, ri->ri_depth);
 
        ri->ri_flg |= RI_VCONS;
        rasops_init(ri, SIMPLEFB_HEIGHT, SIMPLEFB_WIDTH);