dt-bindings: arm: qcom: Document additional skus for sc7180 pazquel360

pazquel360 is an extension project based on pazquel.
We create 3 sku on pazquel360:
   sku 20 for LTE with physical SIM _and_ eSIM and WiFi
   sku 21 for WiFi only
   sku 22 for LTE with only a physical SIM
 Both sku20 and sku22 are LTE SKUs.
 One has the eSIM stuffed and one doesn't.
 There is a single shared device tree for the two.

Signed-off-by: Yunlong Jia <yunlong.jia@ecs.corp-partner.google.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220901024827.v3.1.I3aa360986c0e7377ea5e96c116f014ff1ab8c968@changeid