Minor fixups to h1940 status

Explain why cpufreq is not available, add bootloader status, change "N/A" to "NA"

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Add information on iPAQ RX1950

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>