staging: sm750fb: Rename vCursor to v_cursor in lynxfb_crtc

staging: sm750fb: Rename vCursor to v_cursor in lynxfb_crtc

The struct lynxfb_crtc has a member named vCursor. This name is
CamelCase and is frowned upon. This commit renames it to v_cursor
and makes the necessary changes for the module to build.

This change also fixes the following checkpatch CHECK:

+	unsigned char __iomem *vCursor; /* virtual address of cursor */

Signed-off-by: Benjamin Philip <benjamin.philip495@gmail.com>
CHECK: Avoid CamelCase: <vCursor>
135: FILE: sm750.h:135:
Link: https://lore.kernel.org/r/58dfc3f12deabe3a786ff2b9c75ac24f51724974.1627413010.git.benjamin.philip495@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>