staging: rts5208: Prefer using BIT macro

Replace all instances of bit shifting on 1 with the BIT(x) macro.
This was done using Coccinelle.

@@ int c; @@
- (1 << c)
+ BIT(c)

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>