qspi: versal-net: Add condition for tapdelay register

Add CONFIG_ARCH_VERSAL_NET to select tapdelay register for versal-net.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/2500dd688214e2ec2d54ed3fabbfee0b1ca861a6.1668613229.git.michal.simek@amd.com