pmdomain: bcm: bcm2835-power: Raise ASB poll timeout to 100us

Commit 18605b1b936b ("pmdomain: bcm: bcm2835-power: Increase ASB control
timeout") raised the ASB handshake polling budget from 1us to 5us.
Surveying the pmdomain subsystem, 5us is still one of the smallest polling
budgets by a wide margin. Comparable handshakes in other drivers use:

  - 100us : starfive jh71xx-pmu, apple pmgr-pwrstate
  - 1ms   : renesas rcar-sysc, rmobile-sysc (power-on)
  - 10ms  : renesas rcar-gen4-sysc, sunxi sun55i-pck600
  - 1s    : mediatek mtk-pm-domains, mtk-scpsys

Raise the BCM2835 timeout to 100us, matching analogous drivers. 100us is
still negligible relative to a power-domain transition and gives the V3D
master ASB substantially more headroom to drain under heavy workloads,
assuring us that the timeout is enough for any scenario.

Signed-off-by: Maíra Canal <mcanal@igalia.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Ulf Hansson <ulfh@kernel.org>

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