PCI: dwc: Simplify the return value of PTM debugfs functions returning bool

PCI: dwc: Simplify the return value of PTM debugfs functions returning bool

Replace redundant ternary conditional expressions with direct boolean
returns in PTM debugfs functions. Specifically change this pattern:

    return (condition) ? true : false;

to the simpler:

    return condition;

Signed-off-by: Hans Zhang <18255117159@163.com>
[mani: subject rewording]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Link: https://patch.msgid.link/20250612161226.950937-1-18255117159@163.com