ARM: shmobile: r8a7790: add IIC(B) clocks to dtsi

Signed-off-by: Wolfram Sang <wsa@sang-engineering.com>
[horms+renesas@verge.net.au resolved conflicts]
[horms+renesas@verge.net.au consistently use space as separator]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>