ARM: config: multi v7: Drop unavailable options

SIRF was removed in commit f3a73284 ("ARM: remove sirf prima2/atlas
platforms"). This covers ARCH_SIRF, SERIAL_SIRFSOC, SERIAL_SIRFSOC_CONSOLE,
I2C_SIRF, SPI_SIRF.

EVI_VARS was made x86 only in commit 963fabf3 ("efi: efivars: limit
availability to X86 builds").

Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210615011435.518115-2-joel@jms.id.au