mtd: spi-nor: swp: Create helpers for building the SR register

The status register contains 3 or 4 BP (Block Protect) bits, 0 or 1
TB (Top/Bottom) bit, soon 0 or 1 CMP (Complement) bit. The last BP bit
and the TB bit locations change between vendors. The whole logic of
buildling the content of the status register based on some input
conditions is used two times and soon will be used 4 times.

Create dedicated helpers for these steps.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>

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