rootdir: init.rc: update max TCP window sizes for mobile networks

GRPS: RTT=600ms, max tput=80kbps (class 12 GMSK 4+1)
EDGE: RTT=300ms, max tput=236kbps (class 12 8PSK)
UMTS: RTT=200ms, max tput=384kbps (R99)
HSDPA: RTT=75ms, max tput=14Mbps (cat 10)
HSUPA: RTT=50ms, max tput=14Mbps
HSPA: RTT=50ms, max tput=14Mbps
HSPA+: RTT=50ms, max tput=42Mbps (cat 20)
LTE: RTT=20ms, max tput=100Mbps (class 3)

bug 67569

Change-Id: I9d62359bbd11dc68e3649a7ea2295d0d4e25e3f2
Signed-off-by: Narayan Reddy <narayanr@nvidia.com>
Signed-off-by: Steve Lin <stlin@nvidia.com>