Create PcdShellDefaultDelay to configure the default
delay the shell provides for the user at the start time
if the user wishes to cancel the execution of a potential
startup script.
The shell application already allows the user to override
the delay default value by specifying the -delay cmdline
argument. This however cannot be used when loading the
shell application using direct boot or when integrating
the shell into the platform firmware build.
Thus, a PCD can be easily configured by the developer
either at build time, or even at runtime.
Cc: Ray Ni <ray.ni@intel.com> Cc: Zhichao Gao <zhichao.gao@intel.com> Signed-off-by: Tomas Pilar <tomas@quicinc.com> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>