staging: panel: Prefer using BIT Macro

Replace bit shifting on 1 with the BIT(x) Macro

The semantic patch used to find this is:
@@ int g; @@

-(1 << g)
+BIT(g)

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>