feat(IL0323): Add alternative partial refresh option

Adds Kconfig to enable the alternative partial refresh setting from @aumuell:
"Gates scan only inside of the partial window" instead of setting PTL_SCAN
when configuring the window for partial refreshes seems to limit degrading
of areas outside the refresh window quite a bit.
But https://github.com/CursedHardware/epd-driver-ic/blob/master/IL0323.pdf,
p. 26 states that this is not the "default".

app/module/drivers/display/Kconfig.il0323

@@ -13,3 +13,7 @@ config IL0323
 config IL0323_INVERT
     bool "Invert display"
     default n
+
+config IL0323_ALTERNATIVE_REFRESH
+    bool "Use an alternative approach for partial refreshes"
+    default n

app/module/drivers/display/il0323.c

@@ -124,7 +124,11 @@ static int il0323_write(const struct device *dev, const uint16_t x, const uint16
     ptl[IL0323_PTL_HRED_IDX] = x_end_idx;
     ptl[IL0323_PTL_VRST_IDX] = y;
     ptl[IL0323_PTL_VRED_IDX] = y_end_idx;
+#if IS_ENABLED(CONFIG_IL0323_ALTERNATIVE_REFRESH)
+    ptl[sizeof(ptl) - 1] = 0; // limits fading outside of refresh window
+#else
     ptl[sizeof(ptl) - 1] = IL0323_PTL_PT_SCAN;
+#endif
     LOG_HEXDUMP_DBG(ptl, sizeof(ptl), "ptl");
 
     il0323_busy_wait(cfg);