pci: designware: Update MSI mapping unconditionally

pci: designware: Update MSI mapping unconditionally

Expression to calculate update_msi_mapping in code handling writes to
DESIGNWARE_PCIE_MSI_INTR0_ENABLE is missing an ! operator and should
be:

    !!root->msi.intr[0].enable ^ !!val;

so that MSI mapping is updated when enabled transitions from either
"none" -> "any" or "any" -> "none". Since that register shouldn't be
written to very often, change the code to update MSI mapping
unconditionally instead of trying to fix the update_msi_mapping logic.

Signed-off-by: Andrey Smirnov <[email protected]>
Cc: Peter Maydell <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: [email protected]
Cc: [email protected]
Acked-by: Michael S. Tsirkin <[email protected]>
Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Peter Maydell <[email protected]>