linux_spi: Fix conversion from kHz to Hz.

A kilohertz is exactly 1000 hertz, not 1024 hertz.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Acked-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>

git-svn-id: svn://flashrom.org/flashrom/trunk@1768 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
linux_spi: Stop messing up the units of SPI speed.

'speed' is stored in Hz, so rename the variable to 'speed_hz' to
clarify any potential confusion. Also, when printing the speed after
setting it with an ioctl, convert it to kHz to match the units given
in the message.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Acked-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>

git-svn-id: svn://flashrom.org/flashrom/trunk@1769 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1