Introduce additional SPI status register helpers.

 - spi_prettyprint_status_register_default_welwip():
   It just prettyprints the plain hex value and the welwip bits.
 - spi_prettyprint_status_register_default_bp4():
   Prints the hex value, welwip, bp0-5 and srwd bits.
 - spi_disable_blockprotect_bp2_srwd(),
 - spi_disable_blockprotect_bp3_srwd() and
   spi_disable_blockprotect_bp4_srwd():
   Three new common block unprotection functions for the frequent
   cases where there is a status register lock bit at bit #7 and some
   block protection bits at bits #2-#4, #2-#5 and #2-#6 respectively.

Signed-off-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>

git-svn-id: https://code.coreboot.org/svn/flashrom/trunk@1681 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

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